Did you get pregnant when breastfeeding?

If you got Pregnant breastfeeding how long did it take? I got pregnant with my 2nd baby when just nursing my son at night but it took over a year with ovulation tests and charting and a month of pregnitude to finally concieve. im currently nursing my 3rd son only at night and Im not sure if I should do pregnitude again or if I should be patient (I did get pregnant sooner than a year but it was a chemical pregnancy 😕)